The main parameter determining the thermal insulation properties of the multi-glazed panels is the heat transfer coefficient U which characterises the amount of heat penetrating through the panel to the outside. The lower the coefficient U, the better the thermal insulation properties. It is calculated according to the EN 673 standard.
1. Single-chamber multi-glazed panel: U=1.7 to 1.1 [W/m²K]
2. Double-chamber multi-glazed panel: U=0.8 to 0.5 [W/m²K]